Gaya APA
Azar, B, S., Hagen, S, A. (2006).
Basic english grammar : with Aswer key (Third Edition).
White Plains, NY:
Pearson Longman.
Gaya MLA
Azar, Betty, Schrampfer., Hagen, Stacy, A..
"Basic english grammar : with Aswer key".
Third Edition
White Plains, NY:
Pearson Longman,
2006.
Text.